Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN: 9781133939146
Author: Katz, Debora M.
Publisher: Cengage Learning
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Chapter 37.6, Problem 37.7CE
To determine
The position of people in the room and whether the image is real or virtual.
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What is the magnification of an astronomical telescope whose objective lens has a focal length of 78 cm and whose eyepiece has a focal length of 2.8 cm? The telescope is set so the image of the eyepiece is at infinity (so the viewer’s eye is “relaxed”). What is the overall length of the telescope?
Sketch the situation, defining all your variables
Please sketch it, this is most important.
Imagine that you are the head of a funding agency that can afford to build only one telescope. Which of the four proposed telescopes below
would be best to support?
O A. a radio telescope in orbit above the Earth
B. A gamma ray telescope in orbit above the Earth
O C. An x-ray telescope located on a mountain in Peru
D. An ultraviolet telescope located in the Mojave desert
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Conversion Factors
Part A
What's the distance (in km) between two stars that are marginally resolved? The resolution of a reflecting telescope is calculated exactly the same as for a refracting telescope.
Express your answer using two significant figures.
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d = 9.5×1010 km
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Part B
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For comparison, what is this distance as a multiple of the distance of Jupiter from the sun?
Express your answer using two significant figures.
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ΠΫΠΙ ΑΣΦ
d=6127500000
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Chapter 37 Solutions
Physics for Scientists and Engineers: Foundations and Connections
Ch. 37.2 - A beam in air strikes a glass ball as shown in...Ch. 37.3 - Prob. 37.2CECh. 37.4 - Prob. 37.3CECh. 37.4 - Prob. 37.4CECh. 37.6 - Prob. 37.5CECh. 37.6 - Prob. 37.6CECh. 37.6 - Prob. 37.7CECh. 37 - A camera obscura is used to form an image of a...Ch. 37 - Because you should never stare directly into the...Ch. 37 - Prob. 3PQ
Ch. 37 - Prob. 4PQCh. 37 - Prob. 5PQCh. 37 - Prob. 6PQCh. 37 - Prob. 7PQCh. 37 - Prob. 8PQCh. 37 - Prob. 9PQCh. 37 - Prob. 10PQCh. 37 - Prob. 11PQCh. 37 - Prob. 12PQCh. 37 - Prob. 13PQCh. 37 - Prob. 14PQCh. 37 - Light rays strike a plane mirror at an angle of...Ch. 37 - Prob. 16PQCh. 37 - Prob. 17PQCh. 37 - Prob. 18PQCh. 37 - Prob. 19PQCh. 37 - Prob. 20PQCh. 37 - Prob. 21PQCh. 37 - Prob. 22PQCh. 37 - Prob. 23PQCh. 37 - Prob. 24PQCh. 37 - Prob. 25PQCh. 37 - Prob. 26PQCh. 37 - Prob. 27PQCh. 37 - Prob. 28PQCh. 37 - A convex mirror with a radius of curvature of 25.0...Ch. 37 - The magnitude of the radius of curvature of a...Ch. 37 - Prob. 31PQCh. 37 - The image formed by a convex spherical mirror with...Ch. 37 - An object is placed 25.0 cm from the surface of a...Ch. 37 - Prob. 34PQCh. 37 - Prob. 35PQCh. 37 - Prob. 36PQCh. 37 - Prob. 37PQCh. 37 - Prob. 38PQCh. 37 - Prob. 39PQCh. 37 - Prob. 40PQCh. 37 - Prob. 41PQCh. 37 - Prob. 42PQCh. 37 - Prob. 43PQCh. 37 - Prob. 44PQCh. 37 - Prob. 45PQCh. 37 - Prob. 46PQCh. 37 - Prob. 47PQCh. 37 - Prob. 48PQCh. 37 - Prob. 49PQCh. 37 - Prob. 50PQCh. 37 - Prob. 51PQCh. 37 - Prob. 52PQCh. 37 - Prob. 53PQCh. 37 - Prob. 54PQCh. 37 - Prob. 55PQCh. 37 - Prob. 56PQCh. 37 - You see the image of a sign through a camera...Ch. 37 - Prob. 58PQCh. 37 - Prob. 59PQCh. 37 - Prob. 60PQCh. 37 - An object is placed midway between two concave...Ch. 37 - Prob. 62PQCh. 37 - Prob. 63PQCh. 37 - Prob. 64PQCh. 37 - Prob. 65PQCh. 37 - Prob. 66PQCh. 37 - Observe your reflection in the back of a spoon....Ch. 37 - Prob. 68PQCh. 37 - A small convex mirror and a large concave mirror...Ch. 37 - Prob. 70PQCh. 37 - Prob. 71PQCh. 37 - Prob. 72PQCh. 37 - Prob. 73PQ
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- People are often bothered when they discover that reflecting telescopes have a second mirror in the middle to bring the light out to an accessible focus where big instruments can be mounted. “Don’t you lose light?” people ask. Well, yes, you do, but there is no better alternative. You can estimate how much light is lost by such an arrangement. The primary mirror (the one at the bottom in Figure 6.6) of the Gemini North telescope is 8 m in diameter. The secondary mirror at the top is about 1 m in diameter. Use the formula for the area of a circle to estimate what fraction of the light is blocked by the secondary mirror. Figure 6.6 Focus Arrangements for Reflecting Telescopes. Reflecting telescopes have different options for where the light is brought to a focus. With prime focus, light is detected where it comes to a focus after reflecting from the primary mirror. With Newtonian focus, light is reflected by a small secondary mirror off to one side, where it can be detected (see also Figure 6.5). Most large professional telescopes have a Cassegrain focus in which light is reflected by the secondary mirror down through a hole in the primary mirror to an observing station below the telescope.arrow_forwardLook at the central transparent area of someone’s eye, the pupil, in normal room light. Estimate the diameter of the pupil. Now turn off the lights and darken the room. After a few minutes turn on the lights and promptly estimate the diameter of the pupil. What happens to the pupil as the eye adjusts to the room light? Explain your observations.arrow_forwardImagine that you are the head of a funding agency that can afford to build only one telescope. Which of the four proposed telescopes below would be best to support? OA. a radio telescope in orbit above the Earth B. A gamma ray telescope in orbit above the Earth OC. An x-ray telescope located on a mountain in Peru D.An ultraviolet telescope located in the Mojave desertarrow_forward
- a) Describe what is meant by the term Point Spread Function (PSF), explain the relationship between the PSF and the aperture (entrance pupil) of a telescope. You should refer to the ideas of diffraction and Fourier Optics in your answer. b) Determine the plate scale and theoretical resolving power at a wavelength of 380 x 10-9 m of a telescope with 2 m aperture diameter and focal length of 4m.arrow_forwardYou see a person in the distance. From Figure 1 assume the person of height 'AB’ is reflected onto the retina through the nodal point 'n’ as “ab’. If AB is 2 m in height and 10 m from the nodal point n, what will be the size of the person ('ab’) on the retina in mm? Show your calculations. (Hint use basic trigonometry). 100 m A 2 m be B 17mm Figure 1.arrow_forwardA space-based telescope can achieve a diffraction- limited angular resolution of 0.10" for red light (wavelength 680 nm). A Part A What would the resolution of the instrument be in the infrared, at 4.9 um ? Express your answer using two significant figures. -- ΑΣΦ α = Submit Part B Request Answer α = ? What would the resolution of the instrument be in the ultraviolet, at 50 nm ? Express your answer using two significant figures. 195) ΑΣΦ arc seconds ? arc secondsarrow_forward
- Suppose a 151 mm focal length telephoto lens is being used to photograph mountains 10 km away. a. Where is the image in meters? b. What is the height of the image in centimeters of a 2530 m high cliff on one of the mountains? (Include the sign of the value in your answer.)arrow_forwardPlease refer to part (b) of Figure 1 included with this quiz. Here, theta (the angle the incident ray makes with respect to the vertical) is 40.2 degrees. What is d (the distance between the ray emerging from the bottom of the glass and where the ray would have been if it had continued straight on with no glass to refract it)? 0.34 m 1.57 m 1.79 m 1.12 marrow_forwardASK YOUR TEACHER You want a telescope that discern objects that are at least 3.60 × 107 radians apart. A.) To achieve this resolution, determine what wavelength should be used if the diameter of the primary mirror is 0.7 m. B.) The two stars in a binary star system (two stars in orbit about each other) are 39 AU apart. They would just barely be able to be discerned by your telescope. Determine how far from Earth this binary star system is. 1 AU = 1.496 x 1011 m.arrow_forward
- Consider a telescope with a small circular aperture of diameter 2.0 centimeters. Part A If two point sources of light are being imaged by this telescope, what is the maximum wavelength X at which the two can be resolved if their angular separation is 3.0 × 10-5 radians? Express your answer in nanometers to two significant figures. ► View Available Hint(s) 15. ΑΣΦ A = .149 Submit Previous Answers ? X Incorrect; Try Again; 5 attempts remaining nmarrow_forwardPreliminary Questions 1. Is the image projected on a movie screen real or virtual? What about the image of yourself seen in a bathroom mirror? 2. Hold a shiny spoon in front of you. What differences do you notice about the image of your face seen in the convex and concave sides? 3. Where are the images formed by each side of the spoon? In front or behind the spoon? (Try the parallax method. Look at the image of an overhead light. Hold the tip of a pencil where think the image is. Move your head from side to side. If the image and pencil tip appear to you move relative to each other, adjust the position of the pencil back and forth until they appear to move as one.)arrow_forwardYou put a 1.34-cm high candle 9 cm in front of a lens and you see an image with di = -6.09 cm. On your paper, draw: the lens (draw this as a diverging or converging lens based on the focal length) the optical axis the candle three rays from the object to the image. These rays should reach the lens traveling: parallel to the axis toward the center of the lens toward the focal point (note: for a diverging lens, this would be the focal point on the opposite side as the object) the image a box with the following information about the image: real or virtual upright or inverted magnified, reduced or same size In the space below enter the height of the image in centimetres. If it is inverted, the height will be negative.arrow_forward
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